Wireless Emergency Alerts (WEA's), are pumped automatically to iPhone 4, 4S, and 5 models.
They can include anything from flash flood warnings to information on wanted vehicles.
Both types of alerts are location based, so they'll always be relevant to your current area.
While turning these alerts off isn't recommended (who knows when the information could come in handy or save a life), it is possible to turn them off and on.
To turn alerts on and off follow these steps.
1. Go to Settings.
2. Tap Notifications.
3. Scroll to the bottom, where you can toggle both types of alerts "on" or "off."
4.Scroll to the bottom and toggle Amber and Emergency Alerts "on" or "off."
If needed there are visual instructions.
Go to your "Settings" app.
Scroll to the bottom and toggle Amber and Emergency Alerts "on" or "off."
Read more: http://www.businessinsider.com/turn-off-iphone-emergency-alerts-2013-7#ixzz35fQaHjPY